24 de Dezembro de 1914.

World War I: The "Christmas truce" begins. The so-called "Christmas truce" began on Christmas Eve, December 24, 1914, during World War I, when German troops began decorating the area around their trenches in the region of Ypres, Belgium, for Christmas. They began by placing candles on trees, then continued the celebration by singing Christmas carols. The British troops in the trenches across from them responded by singing English carols.

The two sides continued by shouting holiday greetings to each other. Soon thereafter, there were calls for visits across the "No Man's Land", where small gifts were exchanged — whiskey, cigars, and the like. The artillery in the region fell silent that night. The truce also allowed a breathing spell where recently-fallen soldiers could be brought back behind their lines by burial parties. Proper burials took place as soldiers from both sides mourned the dead together and paid their respect. At one funeral in No Man's Land, soldiers from both sides gathered and read a passage from the 23rd Psalm:

"The Lord is my shepherd. I shall not want. He maketh me lie down in green pastures. He leaveth me beside the still waters. He restoreth my soul. He leadeth me in the path of righteousness for his namesake. Yea, though I walk through the valley of the shadow of death, I will fear no evil."
The truce spread to other areas of the lines, and there are many stories — some perhaps apocryphal — of football matches between the opposing forces. Letters home confirm the score of one of these games to be 3–2 in favour of Germany.

In many sectors, the truce lasted through Christmas night, but in some areas, it continued until New Year's Day.

More here.